The pressure drop of cylindrical acetate fibers is one of the most important physical indicators affecting the adsorption performance of filter materials. In order to analyze the change law of pressure drop when the gas passes through the cylindrical acetate fiber, the geometric modeling of the cylindrical acetate fiber gas channel was constructed by using the ANSYS software, the geometric modeling of the cylinder filter material was meshed, and the gas flow law was simulated by using the Fluent software. The results showed that the gas flows into the cylindrical acetate fiber in a conical shape, and the changes in gas pressure and temperature are consistent and also show a conical shape. The center velocity is the highest and continuously decreases along the radial direction. At 1.2 seconds, the gas flow rate is the fastest, which is consistent with the change in the velocity UDF equation. A calculation method for obtaining the pressure drop of cylindrical acetate fibers at any position through proportional segmentation method was proposed. This method avoids the use of split filter rods, with an error of less than 5%, which improves the calculation efficiency, making it easy to apply in other filter materials.
In order to evaluate and study the static ash holdup of cigarette combustion from various angles, an objective and accurate real-time measurement method of static ash holdup of cigarette combustion is provided. The image acquisition of the test sample during the static combustion of the cigarette is evenly distributed around the test cigarette through 3 cameras, and the camera lens position is perpendicular to the axial direction of the cigarette. Through the simultaneous shooting of 3 sides of a single cigarette in the static combustion state, the image tracking acquisition is carried out in real time, so as to complete the 3-side full vision acquisition of the static ash holdup of the cigarette test sample combustion. The experimental results show that there are great differences among the three groups of static gray holdup data collected by three-side full vision, so it is necessary to take the average value of three-side photography.
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